EP1012928B1 - Verfahren und vorrichtung zur lenkung eines sich bewegenden fluids - Google Patents

Verfahren und vorrichtung zur lenkung eines sich bewegenden fluids Download PDF

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Publication number
EP1012928B1
EP1012928B1 EP97952163A EP97952163A EP1012928B1 EP 1012928 B1 EP1012928 B1 EP 1012928B1 EP 97952163 A EP97952163 A EP 97952163A EP 97952163 A EP97952163 A EP 97952163A EP 1012928 B1 EP1012928 B1 EP 1012928B1
Authority
EP
European Patent Office
Prior art keywords
fluid
motion
tubular
electromagnetic radiation
laser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97952163A
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English (en)
French (fr)
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EP1012928A1 (de
Inventor
Marianne Almesåker
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ALMESAKER, MARIANNE
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Almesaker Marianne
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning

Definitions

  • the present invention relates to a method and a device for directing a fluid in motion.
  • the object of the present invention is therefore to provide a method and a device, which makes it at least partially possible to enclose or direct fluids in motion such as sound wave motion without any mechanical means of guidance.
  • the invention is the result of the discovery by the inventor that particularly collimated and coherent electromagnetic radiation appears to have the ability to shield or direct, such as guide, deflect or reflect a fluid such as air in motion.
  • Tests conducted by the inventor using low energy laser radiation and audible sound emitted in the direction of laser radiation resulted in an appreciable higher level of sound measured at certain distances and orientations from the laser radiation than at other distances and orientations from the laser radiation, indicating fluid shielding or directional properties of laser radiation. While the physical and chemical mechanisms governing this supposed ability of electromagnetic radiation are not yet fully understood, it is assumed that electromagnetic radiation along its path, depending on its intensity or energy, forms a boundary layer in the fluid.
  • the electromagnetic radiation is assumed to excite and ionize the adjacent molecules of the fluid, possibly into a plasma state, and in the case of a gaseous fluid, possibly into a vacuum state.
  • the qualities of the fluid in the boundary layer excited by the electromagnetic radiation are believed to have the ability to direct and at least partially guide, or shield the fluid in motion approaching the boundary layer. Whether these differing qualities of the fluid in the boundary layer actually deflect, reflect, refract or impose a combination of one or more of these and possibly other effects to the molecules of the approaching motive fluid, is not yet fully understood.
  • a method for directing a fluid in motion wherein at least one curtain of electromagnetic radiation is provided for exciting the fluid at the curtain to form a fluid directional layer in the fluid and generating said motion in the fluid as wave propagation in the fluid inside the curtain surrounding the fluid in motion.
  • a device for directing a fluid in motion comprising an electromagnetic radiation emitter adapted to create at least one curtain of electromagnetic radiation for exciting the fluid at said curtain to form a fluid directional layer in the fluid, and an elastic wave generator located inside said emitter for creating said motion.
  • FIG. 1 a curtain 10 of collimated and highly energetic electromagnetic radiation is penetrating a space 12.
  • the curtain is imagined as a section of a tubular beam 10 of laser radiation emitted from a tubular emitter device such as 40, FIG. 4 to be later described.
  • a fluid 14 such as air inside tubular beam 10 is believed to be shielded from the space 12 by the tubular beam 10.
  • the surrounding space may be more or less dense air, or vacuum, whereas in the latter instance the fluid 14 possibly can be pumped into the tubular beam through nozzles such as 42, FIG. 5 from radially inside the tubular emitter device 30.
  • the energy of the electromagnetic radiation curtain 10 is such that the fluid 14 in a boundary layer 16 along the curtain 10 will be excited or ionized, or even form a plasma, so as to alter the transmission properties of the fluid when approaching the boundary layer 16.
  • the electromagnetic radiation is preferably of collimated laser type but other types of electromagnetic radiation such as maser radiation are conceivable.
  • Generally referenced by 20 in FIG. 1 is a section of an elastic wave formation such as a sound wave formation propagating in the fluid 14 and entering the boundary layer 16 at an angle.
  • the indicated course of influenced wave propagation is purely illustrative and only intended as an attempt to explain that the boundary layer 16 is believed to have a directional, refractive and/or reflective influence on the fluid in motion, capable of at least partially possibly penetrating waves are indicated by 24-shielding the motive fluid, or possibly partially containing the fluid 14 in the tubular beam 10.
  • the portion of the wave formation influenced by the boundary layer 16 is shown in dashed line indicated by 22.
  • the interface 18 between the boundary layer and the fluid 14 is also assumed not to be considered as the indicated sudden transition surface between the excited and non-excited states of the fluid but as a transition zone with gradually lower level of fluid excitation as a function of increased distance from tubular beam 10.
  • a vacuum state is created by the electromagnetic radiation in the boundary layer 16 inside the tubular beam 10
  • the vacuum may of course not be allowed to occupy the full interior of the beam in order not to exclude fluid motion therein; a possibly critical relationship between laser energy and tubular beam interior diameter may be obtained by experiments.
  • a device having in common a combined laser-sound emitter 40 contained in a housing 30.
  • a target such as a land-mine to be destroyed or inactivated by high energy laser-sound radiation
  • the housing 30 is supported in a gimbal ring 32 to be rotatable around an axis 34.
  • Electric energy for emitter 40 is supplied to housing 30 in a manner known per se via a cable 38 within one of a pair a journal bearings 35, 35 supporting housing 30 for rotation around axis 34.
  • gimbal ring 32 is supported for rotation around axis 36 via a pair of journal support means 37, 37 to be supported in a mount (not shown) of a vehicle such as a helicopter.
  • actuators (not shown) arranged to rotate housing 30 and gimbal ring 32 about the respective axes 34, 36, are supplied by incremental angular drive signals from computerized information of target location in order to direct the laser-sound transmission onto the target.
  • the embodiments shown on the drawing of the laser-sound emitters 40 according to the invention have all a radially central sound generator 50 and a surrounding laser emitter capable of emitting a tubular beam of discrete or continuous laser radiation enclosing the sound emitted from the sound generator 50.
  • the tubular beam as shown has a circular contour but other closed outlines such as elliptic are possible.
  • the sound generator 50 may be of any suitable type for generating sound waves adapted for the particular type of application of the laser-sound emitter.
  • the sound generator is preferably of a piezoelectric type, using an oscillating circuit including a plate condenser having a quartz plate between the condenser plates.
  • the sound generator 50 may preferably also be of a magnetostrictive type using, for example, a nickel rod in a coil supplied by high frequency AC voltage.
  • such a sound generator 50 is expected to generate sound of an intensity corresponding to about 10 4 times the sound intensity of fire from an ordinary artillery cannon at least partially concentrated within the tubular laser beam.
  • the device can be regarded as a gun not requiring any rounds of ammunition.
  • the sound waves 20 generated this way may also be amplified as needed on increased distance to the target to be destroyed.
  • the effect of radiation from the integrated laser and ultrasound emitter depends on the combined effect from sound and laser beam.
  • the mine sensors will be influenced to disarm the mines by detonating or not detonating the mines by virtue of vibrations caused by the directional and concentrated ultrasound.
  • the laser radiation is expected to cause melting or burning of plastic mines. It is likely that the sensors are influenced in such way that they cannot function as desired to ignite the mines.
  • the laser emitters used in the various embodiments of the invention are suitably ruby lasers, which may have a combined power of about 100 kW. Still higher energies may be obtained by using concentrated solar radiation energy as energy input to the laser device.
  • the tubular beam 10 is composed of a circular array of discrete laser beams or rays 11 from emitters 60.
  • the emitters 60 can be of ruby type having a circular or elliptic reflective cavity (not shown) known in the art.
  • the emitters 60 are further peripherally so closely spaced that the resulting tubular radiation 10 of discrete beams may be considered as a continuous tubular beam.
  • each ray 11 increases with distance from emitter so that the rays 11 may be overlapping at a distance relatively close to the emitters 60. If the laser rays need to be amplified due to dissipation of energy, two or more emitters can be coupled in series where each additional emitter does not start emitting spontaneously but only when, for example, a ruby unit is excited by flashes from a preceding laser emitter (not shown).
  • the continuous tubular beam laser emitter 70 is composed of a tubular ruby laser rod 72 concentrically enclosed by a pair of tubular exciting units 74, 76, each unit containing one or more concentric arrays of pump elements or lamps, such as linear lamps 78.
  • the resulting tubular unit is in turn enclosed by concentric concave and convex cylindrical mirrors or reflective surfaces 80 and 82, respectively, defining the reflective cavity for the tubular beam laser emitter 70.
  • the reflective surfaces 80, 82 may be smooth surfaces having a dense array of ellipsoidal depressions 84 to stimulate excitation.
  • the components of the laser emitters 60, 70 so far described may be varied in different ways as well known in the art of lasers.
  • the remaining components required to configure the fully functional laser emitters are likewise well known in the art of laser technology. Examples of such components are given, for example, in The Laser Guidebook, Second Edition, by Jeff Hecht, McGraw-Hill, Inc.
  • An alternative to a continuously working ruby laser for obtaining continuous laser emission is to use neodymium doped garnet crystals of yttrium-aluminum, yttrium-gallium or gadolinium-gallium type.
  • the continuous laser beam can have the ability to illuminate larger areas in shorter time, automatically and at a safe distance when disarming mines. When extremely high energies are required, it can be considered to use a pulse laser combined with sound pulses of the desired power.
  • This type of laser is equipped with a shutter in the space outside the semi-transmission mirror surface at the outlet of the laser emitter. In this case the effect of influencing the ruby to a saturation level of excited ruby atoms (Q value) can be utilized.
  • Q value saturation level of excited ruby atoms
  • An additional amplification can be obtained if the ruby portion is composed of pure aluminum oxide combined with normal ruby containing a chrome compound.
  • FIG. 7 shows an example illustrating the possibility of forming the boundary layer 16 between a pair of curtains 10,10' of laser radiation to possibly enhance the fluid directional properties of the excited boundary layer. More precisely, the fluid in the space between a pair of concentric tubular laser beams 10, 10' is excited by the beams to form a plasma or vacuum state.
  • Each of the emitters for forming the concentric tubular beams 10, 10' could be of the types described in connection with FIGS. 2 and 4 .
  • the emitter of FIG. 4 is supplemented with an additional outer pair of a respective concentric tubular ruby 73 and exiting unit 75.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Lasers (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Forging (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
  • Power Steering Mechanism (AREA)

Claims (14)

  1. Verfahren zum Lenken eines sich in Bewegung (20) befindlichen Fluids (14) durch Bereitstellen wenigstens eines Vorhangs (10, 10'), der aus einem röhrenförmigen Strahl einer elektromagnetischen Strahlung ausgebildet ist, welche das sich bewegende Fluid umgibt, zum Erregen des Fluids an dem Vorhang, um eine gerichtete Fluidschicht in dem Fluid auszubilden, und Erzeugen der Bewegung in dem Fluid als eine Fortpflanzung (20) einer elastischen Welle in dem Fluid mittels eines Generators der elastischen Welle, der in dem Vorhang, der das sich in Bewegung befindliche Fluid umgibt, positioniert ist.
  2. Verfahren nach Anspruch 1, bei dem die elektromagnetische Strahlung eine kohärente elektromagnetische Strahlung ist.
  3. Verfahren nach einem der vorhergehenden Ansprüche, bei dem die elektromagnetische Strahlung eine Laserstrahlung ist.
  4. Verfahren nach Anspruch 1 oder 2, bei dem die elektromagnetische Strahlung eine Maserstrahlung ist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, umfassend ein Ausbilden gegenseitig beabstandeter Vorhänge (10, 10') der elektromagnetischen Strahlung.
  6. Verfahren nach einem der vorhergehenden Ansprüche, bei dem das Erregen des Fluids eine Ionisierung umfasst.
  7. Verfahren nach einem der vorhergehenden Ansprüche, bei dem das Erregen des Fluids ein Erzeugen eines Vakuums in der Schicht (16) in dem Fluid umfasst.
  8. Einrichtung zum Lenken eines sich in Bewegung befindlichen Fluids, die einen Emitter einer elektromagnetischen Strahlung (60, 70, 90), der angepasst ist, um wenigstens einen Vorhang (10, 10') zu erzeugen, der aus einem röhrenförmigen Strahl einer elektromagnetischen Strahlung ausgebildet ist, die das sich in Bewegung befindliche Fluid umgibt, zum Erregen des Fluids an dem Vorhang, um eine gerichtete Fluidschicht in dem Fluid auszubilden, und einen Generator für elastische Wellen (50) umfasst, der in dem Emitter (60, 70, 90) zum Erzeugen der Bewegung positioniert ist.
  9. Einrichtung nach Anspruch 8, bei welcher der Emitter aus einem Gitter von Laseremittern (60) zum Emittieren des röhrenförmigen Strahls (10) der Strahlung beinhaltet.
  10. Einrichtung nach einem der Ansprüche 8 und 9, bei dem der Emitter einen kontinuierlichen röhrenförmigen Strahllaseremitter (70, 90) beinhaltet.
  11. Einrichtung nach Anspruch 10, bei welcher der Emitter (70) einen röhrenförmigen reflektierenden Hohlraum beinhaltet.
  12. Einrichtung nach Anspruch 11, bei welcher der röhrenförmige reflektierende Hohlraum einen röhrenförmigen Rubinstab (72) beinhaltet, der von konzentrischen Erregereinheiten (74, 76) umgeben ist.
  13. Einrichtung nach Anspruch 11, bei welcher der röhrenförmige reflektierende Hohlraum ein Paar von konzentrischen röhrenförmigen Rubinstäben (72, 73) beinhaltet, die von konzentrischen Erregereinheiten (74, 75, 76) umgeben und getrennt sind.
  14. Einrichtung nach einem der Ansprüche 8 bis 13, bei welcher der Generator der elastischen Welle einen Ultraschallgenerator (50) umfasst.
EP97952163A 1996-12-30 1997-12-30 Verfahren und vorrichtung zur lenkung eines sich bewegenden fluids Expired - Lifetime EP1012928B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9604850A SE9604850L (sv) 1996-12-30 1996-12-30 Radiosound och dess koncept för detonering och oskadliggöring av oönskade eller explosiva föremål/objekt
SE9604850 1996-12-30
PCT/SE1997/002209 WO1998029926A1 (en) 1996-12-30 1997-12-30 Method and device for directing a fluid in motion

Publications (2)

Publication Number Publication Date
EP1012928A1 EP1012928A1 (de) 2000-06-28
EP1012928B1 true EP1012928B1 (de) 2009-06-03

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Application Number Title Priority Date Filing Date
EP97952163A Expired - Lifetime EP1012928B1 (de) 1996-12-30 1997-12-30 Verfahren und vorrichtung zur lenkung eines sich bewegenden fluids

Country Status (8)

Country Link
US (1) US6281492B1 (de)
EP (1) EP1012928B1 (de)
AT (1) ATE433213T1 (de)
AU (1) AU5582298A (de)
CA (1) CA2276389C (de)
DE (1) DE69739443D1 (de)
SE (1) SE9604850L (de)
WO (1) WO1998029926A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7999173B1 (en) 2007-03-21 2011-08-16 The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Dust removal from solar cells
US10060716B2 (en) * 2014-12-01 2018-08-28 Matthew Creedican Explosives manipulation using ultrasound
WO2016210136A2 (en) * 2015-06-23 2016-12-29 Advanced Csf Therapies, Llc Methods and system for ultrasonic targeted drug delivery in cystic fluids, such as the cerebrospinal fluid, using buoyancy specific drug carriers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814983A (en) * 1972-02-07 1974-06-04 C Weissfloch Apparatus and method for plasma generation and material treatment with electromagnetic radiation
US4016417A (en) * 1976-01-08 1977-04-05 Richard Glasscock Benton Laser beam transport, and method
FR2677133B1 (fr) 1991-05-28 1993-12-17 Coudert Anne Marie Dispositif de detection et de destruction a distance de mines et engins explosifs.

Also Published As

Publication number Publication date
SE9604850D0 (sv) 1996-12-30
CA2276389C (en) 2005-06-28
EP1012928A1 (de) 2000-06-28
DE69739443D1 (de) 2009-07-16
SE9604850L (sv) 1998-07-01
US6281492B1 (en) 2001-08-28
ATE433213T1 (de) 2009-06-15
WO1998029926A1 (en) 1998-07-09
CA2276389A1 (en) 1998-07-09
AU5582298A (en) 1998-07-31

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